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单选题
The gear and screw pumps are classified as （）.
A
variable stroke pumps
B
multistage pumps
C
positive displacement pumps
D
triple-ported pumps
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fire pumps be tested by starting within 12 hours prior to departureC
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考题
单选题The gear and screw pumps are classified as （）.A
variable stroke pumpsB
multistage pumpsC
positive displacement pumpsD
triple-ported pumps
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